Face-elicited ERPs and affective attitude: brain electric microstate and tomography analyses

被引:80
作者
Pizzagalli, D
Lehmann, D
Koenig, T
Regard, M
Pascual-Marqui, RD
机构
[1] Univ Zurich Hosp, Dept Neurol, CH-8091 Zurich, Switzerland
[2] Univ Zurich, Hosp Psychiat, Key Inst Brain Mind Res, CH-8029 Zurich, Switzerland
关键词
emotion; event related potential microstates; brain functional imaging; low resolution electromagnetic tomography; personality; laterality;
D O I
10.1016/S1388-2457(99)00252-7
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
Objectives: Although behavioral studies have demonstrated that normative affective traits modulate the processing of facial and emotionally charged stimuli, direct electrophysiological evidence for this modulation is still lacking. Methods: Event-related potential (ERP) data associated with personal, traitlike approach- or withdrawal-related attitude (assessed post-recording and 14 months later) were investigated in 18 subjects during task-free (i.e. unrequested, spontaneous) emotional evaluation of faces. Temporal and spatial aspects of 27 channel ERP were analyzed with microstate analysis and low resolution electromagnetic tomography (LORETA), a new method to compute 3 dimensional cortical current density implemented in the Talairach brain atlas. Results: Microstate analysis showed group differences 132-196 and 196-272 ms poststimulus, with right-shifted electric gravity centers for subjects with negative affective attitude. During these lover subjects reliably identifiable) personality-modulated, face-elicited microstates, LORETA revealed activation of bilateral occipito-temporal regions, reportedly associated with facial configuration extraction processes. Negative compared to positive affective attitude showed higher activity right temporal; positive compared to negative attitude showed higher activity left temporo-parieto-occipital. Conclusions: These temporal and spatial aspects suggest that the subject groups differed in brain activity at early, automatic, stimulus-related face processing steps when structural face encoding (configuration extraction) occurs. In sum, the brain functional microstates associated with affect-related personality features modulate brain mechanisms during face processing already at early information processing stages. (C) 2000 Elsevier Science Ireland Ltd. All rights reserved.
引用
收藏
页码:521 / 531
页数:11
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